Laminated optical disk

Abstract

A laminated optical disk, applied for lighting system or solar energy system, includes a plurality of annular lenses, a base and a circular light guiding unit. The annular lenses are arranged in order from center to outside to form a disk-structure. Each annular lens has a light-input curved surface and a light-output curved surface respectively matching the different thickness of the base. The light-input curved surface is opposite to the center. The light-output curved surface is opposite to the light-input curved surface, and facing to the center. The light is incident on the light-input curved surface, refracted and tended to concentrate by the light-input curved surface. Besides, the light exiting from the annular lens is to be refracted to the direction of the center by the light-output curved surface. The base of the laminated optical disk can significantly improve the light leakage problem by different annular lenses.

What is claimed is: 
     
       1. A laminated optical disk comprising:
 a first annular lens, having a center, a first light-input curved surface and a first light-output curved surface, wherein the first light-output curved surface faces the center, and the first light-input curved surface is disposed opposite to the first light-output curved surface; 
 a second annular lens, surrounding outside of the first annular lens, wherein the first annular lens and the second annular lens are arranged in a concentric manner, the second annular lens has a second light-input curved surface and a second light-output curved surface, the second light-output curved surface faces the first light-input curved surface, the second light-input curved surface is disposed opposite to the second light-output curved surface; 
 a base, connected to the underside of the first annular lens and the second annular lens, and providing a first horizontal plane, a second horizontal plane located below the first horizontal plane, and a third horizontal plane located below the second horizontal plane, wherein the first horizontal plane is connected to the first light-output curved surface, the second horizontal plane is connected between the first light-input curved surface and the second light-output curved surface, and the third horizontal plane is connected to the second light-input curved surface; and 
 a circular light guiding unit, disposed at the center of the first annular lens, wherein the circular light guiding unit has an inverted conical hollow portion and an outer curved surface, wherein the outer curved surface is connected to the first horizontal plane, the inverted conical hollow portion has an inner sidewall opposite to the outer curved surface. 
 
     
     
       2. The laminated optical disk of  claim 1 , wherein the circular light guiding unit has a slot, the slot is located below the inverted conical hollow portion, and has a downward opening. 
     
     
       3. The laminated optical disk of  claim 2 , wherein the circular light guiding unit has a second inverted conical hollow portion, the second inverted conical hollow portion is disposed under the inverted conical hollow portion, and located directly above the slot. 
     
     
       4. The laminated optical disk of  claim 1 , wherein each of the annular lenses has an inclined reflective surface for reflecting the ambient light toward the center. 
     
     
       5. The laminated optical disk of  claim 4 , wherein the base has a bottom plane, and the inclined reflective surface and the bottom plane have an included angle of 45 degrees. 
     
     
       6. The laminated optical disk of  claim 4 , wherein the first light-output curved surface of the first annular lens and the second light-output curved surface of the second annular lens are concave free-form curved surfaces. 
     
     
       7. The laminated optical disk of  claim 6 , wherein the concave free-form curved surfaces are spherical curved surfaces. 
     
     
       8. The laminated optical disk of  claim 6 , wherein the outer curved surface of the circular light guiding unit, the first light-input curved surface of the first annular lens, and the second light-input curved surface of the second annular lens are convex free-form curved surfaces. 
     
     
       9. The laminated optical disk of  claim 8 , wherein the convex free-form curved surfaces are spherical curved surfaces.